In routine overbalanced drilling, the bottom hole pressure towers above the formation pressure so that the mud fluid will leak into the formation.

 
  • 常規過(guò)平衡鉆井方式打開(kāi)油氣層時(shí),井底壓力高于地層壓力,鉆井流體會(huì )向地層滲濾甚至漏失。
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